Is this flu A or B?

Influenza is a common infectious disease. There are two main types of seasonal influenza: Influenza A and Influenza B, which differ significantly in terms of etiology. Influenza A is an infectious disease caused by Influenza virus subtype A. Both belong to the same viral family, but Influenza A primarily occurs during winter, spreads relatively quickly, and tends to cause more severe illness. Additionally, it has high variability and mainly spreads from person to person through respiratory droplets. In contrast, Influenza B is caused by Influenza virus subtype B, with peak incidence concentrated in spring and summer. It spreads more slowly and generally causes milder symptoms without leading to severe cases; it usually does not pose a significant threat to public health. The transmission routes for Influenza B are primarily through direct contact and airborne particles. Therefore, accurately distinguishing between Influenza A and Influenza B requires consideration of factors such as the season of onset, transmission routes, speed of spread, and patient symptoms. Since they are caused by different viruses with distinct symptoms, prevention and treatment strategies should be tailored according to specific circumstances.